![gas mask breathing sound gas mask breathing sound](https://i1.sndcdn.com/artworks-35iWUK6iBaHC-0-t500x500.jpg)
It is necessary, but the player doesn't have to do it often, but only if it needs to be done (or if the player feels like their vision is too obscured). In Metro: Last Light, whenever liquid gets on the gas mask (if the character is wearing it at the time), the player character can wait for it to naturally get off, or quickly wipe off the gas mask.In most cases, Artyom has about 50 seconds to find a new gas mask or a new filter before dying. This can be used as an easy means of telling how much time is left on a filter. Artyom's mask becomes increasingly foggy with condensation as his filter runs out.Paying attention to breathing patterns is more useful in Metro 2033 than in Last Light, as in Last Light the indicator on the watch is easier to notice. Artyom's breathing will be faster while the filter is about to be changed, this is handy in Ranger difficulties since the indicator on Artyom's watch can be hard to read sometimes, especially if player's graphics setting is low.So he can save filters if he just wear the mask every 30 Seconds.
![gas mask breathing sound gas mask breathing sound](https://cdn.shopify.com/s/files/1/0648/9279/files/how-to-use-a-gas-mask-bong.jpg)